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Here s the code that loads the selected control: protected void Page_Load(object sender, System.EventArgs e) { // Remember that the control must be loaded in the Page.Load event handler. // The DropDownList.SelectedIndexChanged event fires too late. string ctrlName = listControls.SelectedItem.Value; if (ctrlName.EndsWith(".ascx")) { placeHolder.Controls.Add(Page.LoadControl(ctrlName)); } lbl.Text = "Loaded..." + ctrlName; } This example demonstrates a number of interesting features. First, because the PlaceHolder is stored in a formatted container, the user controls you load automatically acquire the container s font, background color, and so on (unless they explicitly define their own fonts and colors). Best of all, because you re loading these controls when the Page.Load event fires, the control objects are able to handle their own events. You can try this by loading the TimeDisplay user control and then clicking the link to refresh the time.

Most of the code in an ASPNET web page is placed inside event handlers that react to web control events Using Visual Studio, you can add an event handler to your code in three ways: Type it in by hand: In this case, you add the method directly to the page class You must specify the appropriate parameters so that the signature of the event handler exactly matches the signature of the event you want to handle You ll also need to edit the control tag so that it links the control to the appropriate event handler (Alternatively, you can use delegates to wire this up programmatically) Double-click a control in design view: In this case, Visual Studio will create an event handler for that control s default event (and adjust the control tag accordingly) For example, if you double-click the page, it will create a Page.

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Caution When you create skins that specify details such as sizing, be careful. When these settings are applied to a page, they could cause the layout to change with unintended consequences. If you re in doubt, set a SkinID so that the skin is applied only if the control specifically opts in.

Because the TimeDisplay control isn t loaded until the page is posted back at least once, it won t show the time until you click the link at least once. Instead, it will start with the generic control name text. You can solve this problem in a number of ways, including calling the RefreshTime() method from your web page when the control is loaded. An even better approach is to create an interface for all your user controls that defines certain basic methods, such as InitializeControl(). That way, you can initialize any control generically. Most portal frameworks use interfaces to provide this type of standardization.

Load event handler If you double-click a Button control, Visual Studio will create an event handler for the Click event Choose the event from the Properties window: Just select the control, and click the lightning bolt in the Properties window You ll see a list of all the events provided by that control Double-click in the box next to the event you want to handle, and Visual Studio will automatically generate the event handler in your page class and adjust the control tag The second and third options are the most convenient The third option is the most flexible, because it allows you to select a method in the page class that you ve already created Just select the event in the Properties window, and click the drop-down arrow at the right.

It s not too difficult to extend this example to provide an entire configurable web page. All you need to do is create more panels and organize them on your web page (possibly using tables and other panels to group them). This might seem like a tedious task, but you can actually use it quite effectively by writing some generic code that deals with all the panels on your page. One option is to create a user control that loads other user controls. Another approach is a custom method, as shown here, which handles user control loading for three panels: protected void Page_Load(object sender, System.EventArgs e) { LoadControls(div1); LoadControls(div2); LoadControls(div3); } private void LoadControls(Control container) { DropDownList list = null; PlaceHolder ph = null; Label lbl = null; // Find the controls for this panel. foreach (Control ctrl in container.Controls) { if (ctrl is DropDownList) { list = (DropDownList)ctrl;

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